#include <iostream>

int main(){
    unsigned u =10;
    int i = -42;
    std::cout<<i + i<<std::endl;
    std::cout<<u+i<<std::endl;

    unsigned u1 = 42, u2 = 10;
    std::cout<<u1-u2<<std::endl;
    std::cout<<u2 -u1 <<std::endl;

    unsigned n =11;
    while(n > 0){
        --n;
        std::cout<< n <<std::endl;
    }
    return 0;
}